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%%
%% A DANTE-Edition example
%%
%% Example 30-04-13 on page 612.
%%
%% Copyright (C) 2011 Herbert Voss
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%
%%
%% ====
% Show page(s) 1
%%
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}
\usepackage{pstricks-add}
\def\Func{exch RadtoDeg sin -9.81 mul}
\begin{document}
\psset{yunit=1.5,xunit=2,showpoints}
\begin{pspicture}[showgrid](0,-1.5)(3,2)
\psplotDiffEqn[linecolor=black!40]{0}{3}{1 0}{\Func}
\psplotDiffEqn[method=adams,linestyle=dashed]{0}{3}{1 0}{\Func}
\psplotDiffEqn[method=rk4]{0}{3}{1 0}{\Func}
\rput[rb](2.9,-0.9){Runge-Kutta (rk4)}\rput[rb](1.9,1.3){Euler}
\end{pspicture}
\end{document}
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